Does Emit do anything in 2.5?

Been wondering, what does Emit do in 2.5 anymore? Seems like since it can’t be used to be a broad surface light, I don’t know what it’s used for.

Any input as to its usefulness would be appreciated. It doesn’t seem to actually emit any light.

Quoting from Blender Essentials

Emit: slider on Shaders tab. This slider determines how much of an object is “self-lit”. This will neither cast light on objects, nor produce a glowing halo, but models that emit light in the real world (like a light bulb) should have this value turned up to prevent them from being excessively shaded by surrounding light sources.